of toledo



G. C. ROHDE.

SPARK PLUG.

Mmcxow man Muze. m9.

1,335,797. Patented Apr. 6, 1920.

IHV'ELLTL un UNITED STATES i raTENT oEEIcE.

OTTO C. ROI-IDE, 0F TOLEDO, OHIO. ASSIGNOR T0 CHAMPION SIARK PLUG COMPANY, 0F TOLEDO, OHI, A CORPORATION 0F DELAWARE.

SPARK-PLU G.

Specification ol.' Letters Patent.

Patented A pr. (i. 1920.

To all u [tout it may 'om'crn Be l.. known that I, O'rro C. Renon, a citizen of the' United States, und a resident of Toledo, in the county of Lucas and State of Ohio, have invented a certain new and useful Spark-Plug; and I do hereby declare the following to he n full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to which it Vaplpltllins to make and use the same, reference bein Vhad to the accompanying drawings an to the characters of reference marired thereon, which forma part of this specification.

-Theinvention relates to spark plugs for internal combustion engines, and has for its object the provision of a simple and imroved construction of `spark plug whereby itsfinsulator is provided with two separate electrode wires and terminal connections therefor, so disposed that they are effectively insulabedfrom each other and enable the plug to be used either as a series or as a dual ignition spark plug.

The invention is fully described in the following specification, and while, in its broader aspect, it is capable of embodiment in numerous forms, appreferred embodiment thereof is illustrated in the accompanying drawings, in whiel1 Figure 1 is-a side elevation of a spark plug embed '.n the invention.l Fig. 2 is a central longitu inal secton'thereof adapted for dual ignition. Fig. 3 is a similar section of Vthe spark lng embodying .the invention and adapted) for use as a series plug, and Fig. 4 is a cross-section on the line 4.-4 in Fi 3.

Regarring to the drawings, 1 designates the insulator of the spark lu which may be of porcelain or any suitab e insulatinf material, 2 the customary metal body shel having an opening therethrough in which the insulator 1 seats and, in the present in stance, being provided with an internal gland nut 3 for coacting with the insulator hold it firmly to its seat in the shell as well understood in the art. The construetion of the shell 2 is such as to enable itto' be used in ,anv standard automotive engine and to permit the use of a. standard socket 'wrench` in screwing the plug into or unscrewing it from-its receivin f opening 1n the angine. lt will be unders ood that While a gland nut 3 is illustrated in connection with the shell 2 for securing the insulator in the Shell, this may be accomplished in any other suitable or well known manner as is apparent.

The insulator l may be of the ordinary insulator construction except that instead of being provided with one longitudinal opening therethrough for receiving un electrode wire, it is provided with two of such o ienings which are transversely spaced ant in each of which is cemented or otherwise suitably secured an electrode wire 4, and the upper or outer end of the insulator is flattened or inout at opposite sides thereof in planes parallel to the eparina of the electrode wires, as shown at lach flattened portion 5 is provided with a socket 6 which .crickets are transversely spaced from each other to provide an insulating wall therebetween und extend inward beyond-,the respective electrodelwire receiving openings 7 und in intersecting relation therewith, as shown. The sockete 1, however, terminate Short of the oppositr side of the insulator. A ter minal plug ti is inserted into each socket G -being sernrely cemented therein and is provided transversely therethrough with an opening 9 in register with the electrode wire receivin opening 7 and adapted to receive and ma e electrical connection with the ad- 'jacent end portidnof an electrode wire dis` posed in the respective opening 7. After an electrode wire 4 has beenY positioned in an opening 7 and electrically connected to a plug 8, the outer end of the opening 7 is closed with a suitable insulating cement.

Each plug 8 is provided at its outer end with a terminal connecting head which is, in the present instance, of the slip connection type and the outer end of the head terminates short of or does not project be ond the onteiside of the body ortion o the insulator 1 so as not to inter ere with placingr u socket wrench over the plug.

If it is desired to make the plug of the dual ignition type, the outer ends of the electrode 4 are turned outwardly or away from each other and into adjacent sparking relation to res ective terminal points 11 projecting from t e outer end of the shell 2 at opposite sides thereof, as shown in Fi 2. Ii. on the other hand, it is desired to ave the plug function as a Series spark plug,

the shell terminals 11 may be eliminated and the angled outer ends of the electrode wires ti'rned toward each other in proper sparkin relation, as illustrated in i 3.

it is therefore apparent that with my construrtion of plug it may be adapted to funi-- tion either as a series spark plug 'or as a dual ignition spark plug. It is also efidenl that I have provided a simple and ellicient means for providing a lateral terminal con neetion for the electrode wires with the terininal wire ronneetingr ends thereof disposed at opposite sides 0f the insulator, and that the separate teipninal plugs are effectively insulated from each other.

wish it understood that my invention is not limited to any specific construction, ar rangement or form of the artsI as it is ifapalile of numerous modifications and changes without departingr from the spirit if the claims.

Haring4 thus described niy invention, what I claim as new and desire to secure by Letters Patent, is,-

1. In a spark plug, an insulator having two longitudinal openings therein and having separate transverse sockets adjacent to its outer 'end and extending in opposite directions, one frein each of said longitudinal openings with their inner ends in transversely spaced lapping relation, aneleetrode wire in each longitudinal opening, and a tier mina] plug fixed in each transverse socket and having a transverseopening into which the respective electrode wire fits, said plugs having their terminal connecting ends exposed at opposite sides ofthe insulator.

2. In a spark plug, an insulator having two longitudinal openings therein and' haviup,r separate transverse sockets adjacent to its outer end and extending in opposite direetions, one from each of said longitudinal openings, with their inner ends in transversely spaced lapping relation, an electrode wire in each longitudinal opening, and a terminal plug fixed in each -transverse socket and ha\in,r a transverse opening into .which the respective electrode Wire fits, said plugs having their terminal connecting ends exposed at opposite sides of the insulator and inset relative to the sides of the insulator body.

3. In a spark plug, an insulator havingr opposite sides of its outer end portion ilattened and having a transverse socket proiecting inward from each flattened portion with the sockets in spaced arallel relation and terminating short of tie opposite flatn ltened side of the insulator, with their inner ends in transversely spaced lapping relation, a terminal plug fixedly proJecting into cae-li of said sockets and having a transverse opening within the insulator and an eleotrede wire disposed longitu inally in the insulator for each )lug and having an end thereof fitted into die transverse opening of the respective plug.

In testimony whereof, I have hereunto signed my name to this specification.

OTTO C. ROHDE Tio lio 

